Andrew Wiens
Battery drain test (http://adwiens.com/projects/balloons/batt/index.html)
See http://adwiens.com/projects/balloons/batt/index.html
Revision 0:1c367d1c3ad3, committed 2014-01-20
- Comitter:
- adwiens
- Date:
- Mon Jan 20 22:48:40 2014 +0000
- Commit message:
- works great
Changed in this revision
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp Mon Jan 20 22:48:40 2014 +0000
@@ -0,0 +1,48 @@
+#include "mbed.h"
+#include "rtos.h"
+
+#define ON_SECS (10)
+#define OFF_SECS (10)
+#define SAMPLE_RATE_HZ (5)
+
+Serial pc(USBTX, USBRX);
+DigitalOut relay(p21);
+DigitalOut led1(LED1);
+DigitalOut led2(LED2);
+AnalogIn adc(p20);
+LocalFileSystem local("local");
+
+double get_voltage(double d) { /* calibrated in freezer */
+ return 8.14*d;
+}
+
+void relay_thr(void const *argument) {
+ int i;
+ while(1) {
+ relay = led1 = 1;
+ for(i=0; i<ON_SECS; ++i) Thread::wait(1000);
+ relay = led1 = 0;
+ for(i=0; i<OFF_SECS; ++i) Thread::wait(1000);
+ }
+}
+
+void log_thr(void const *argument) {
+ FILE *fp = fopen("/local/bv.csv", "a");
+ fprintf(fp,"BEGIN\n");
+ fclose(fp);
+ while(1) {
+ led2 = 1;
+ FILE *fp = fopen("/local/bv.csv", "a");
+ fprintf(fp, "%d,%f\n",(int)relay,get_voltage(adc)-5.0);
+ printf("%d,%f\n",(int)relay,get_voltage(adc)-5.0);
+ fclose(fp);
+ led2 = 0;
+ Thread::wait(1000/SAMPLE_RATE_HZ);
+ }
+}
+
+int main() {
+ Thread relay_thread(relay_thr); // toggles relay
+ Thread log_thread(log_thr); // logs batt voltage
+ while(1);
+}
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed-rtos.lib Mon Jan 20 22:48:40 2014 +0000 @@ -0,0 +1,1 @@ +https://mbed.org/users/mbed_official/code/mbed-rtos/#29007aef10a4
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed.bld Mon Jan 20 22:48:40 2014 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/mbed_official/code/mbed/builds/a9913a65894f \ No newline at end of file